ABNF in RFC5321

[Murray S. Kucherawy]

It looks to me like there's an ABNF citation issue in RFC5321.  Section 4.1.2's 
ABNF makes reference to "atext" but it's not defined anywhere.  It is defined 
in RFC5322 though.

I don't see this covered in any RFC5321 errata.  Shall I open one?

-MSK